modifyrelationship cheat is not working.

I've been using the modifyrelationship (Sim1FirstName Sim1LastName) (Sim2FirstName Sim2LastName) 100 LTR_Friendship_Main cheat for a few years now, and all of a sudden, it's not working. I ran a file check and there are no corrupt game files. I've also gone through CAS to make sure there aren't any extra spaces in the names, and there aren't any extra spaces in either name.

Does anyone know how to fix this bug?